import $ from "jquery";

function getVerticalImage() {
    const image_l = []
    const files = require.context('@/assets/images/', false, /(\.png|\.jpg|\.jpeg)$/)
    files.keys().forEach(path => {
        image_l.push(require('@/assets/images/' + path.slice(2)))
    })
    return image_l
}

function translational_loginBox(){
    $(() => {
        $("#signIn").click(() => {
            $('.container').toggleClass("right-panel-active");
        })
        $('#signUp').click(() => {
            $('.container').toggleClass("right-panel-active");
        })
        for (let i = 0; i < 4; i++) {
            const image_list = getVerticalImage()
            // console.log("url(" + image_list[i] + ") no-repeat 0 50%")
            $('.slidershow--image').eq(i).css({
                background: "url(" + image_list[i] + ") no-repeat 0 50%"
            })
        }
    })
}

function create_fish() {
    const FISH = function (renderer) {
        this.renderer = renderer;
        this.init();
    };
    const SURFACE_POINT = function (renderer, x) {
        this.renderer = renderer;
        this.x = x;
        this.init();
    };
// 使用到的参数
    const RENDERER = {
        POINT_INTERVAL: 10,
        FISH_COUNT: 2,
        MAX_INTERVAL_COUNT: 40,
        INIT_HEIGHT_RATE: 0.5,
        THRESHOLD: 50,

        // 对整个页面的初始化
        init: function () {
            this.setParameters();
            this.reconstructMethods();
            this.setup();
            this.bindEvent();
            this.render();
        },
        // 对象的函数
        setParameters: function () {
            this.$window = $(window);
            this.$container = $('#fish-container');
            this.$canvas = $('<canvas />');
            this.context = this.$canvas.appendTo(this.$container).get(0).getContext('2d');
            this.points = [];
            this.fishes = [];
            this.watchIds = [];
        },
        createSurfacePoints: function () {
            const count = Math.round(this.width / this.POINT_INTERVAL);
            this.pointInterval = this.width / (count - 1);
            this.points.push(new SURFACE_POINT(this, 0));

            for (let i = 1; i < count; i++) {
                const point = new SURFACE_POINT(this, i * this.pointInterval),
                    previous = this.points[i - 1];

                point.setPreviousPoint(previous);
                previous.setNextPoint(point);
                this.points.push(point);
            }
        },
        reconstructMethods: function () {
            this.watchWindowSize = this.watchWindowSize.bind(this);
            this.jdugeToStopResize = this.jdugeToStopResize.bind(this);
            this.startEpicenter = this.startEpicenter.bind(this);
            this.moveEpicenter = this.moveEpicenter.bind(this);
            this.reverseVertical = this.reverseVertical.bind(this);
            this.render = this.render.bind(this);
        },
        setup: function () {
            this.points.length = 0;
            this.fishes.length = 0;
            this.watchIds.length = 0;
            this.intervalCount = this.MAX_INTERVAL_COUNT;
            this.width = this.$container.width();
            this.height = this.$container.height();
            this.fishCount = this.FISH_COUNT * this.width / 500 * this.height / 500;
            this.$canvas.attr({width: this.width, height: this.height});
            this.reverse = false;

            this.fishes.push(new FISH(this));
            this.createSurfacePoints();
        },
        watchWindowSize: function () {
            this.clearTimer();
            this.tmpWidth = this.$window.width();
            this.tmpHeight = this.$window.height();
            this.watchIds.push(setTimeout(this.jdugeToStopResize, this.WATCH_INTERVAL));
        },
        clearTimer: function () {
            while (this.watchIds.length > 0) {
                clearTimeout(this.watchIds.pop());
            }
        },
        jdugeToStopResize: function () {
            const width = this.$window.width(),
                height = this.$window.height(),
                stopped = (width === this.tmpWidth && height === this.tmpHeight);

            this.tmpWidth = width;
            this.tmpHeight = height;

            if (stopped) {
                this.setup();
            }
        },
        bindEvent: function () {
            this.$window.on('resize', this.watchWindowSize);
            this.$container.on('mouseenter', this.startEpicenter);
            this.$container.on('mousemove', this.moveEpicenter);
            // this.$container.on('click', this.reverseVertical);
        },
        getAxis: function (event) {
            const offset = this.$container.offset();

            return {
                x: event.clientX - offset.left + this.$window.scrollLeft(),
                y: event.clientY - offset.top + this.$window.scrollTop()
            };
        },
        startEpicenter: function (event) {
            this.axis = this.getAxis(event);
        },
        moveEpicenter: function (event) {
            const axis = this.getAxis(event);

            if (!this.axis) {
                this.axis = axis;
            }
            this.generateEpicenter(axis.x, axis.y, axis.y - this.axis.y);
            this.axis = axis;
        },
        generateEpicenter: function (x, y, velocity) {
            if (y < this.height / 2 - this.THRESHOLD || y > this.height / 2 + this.THRESHOLD) {
                return;
            }
            const index = Math.round(x / this.pointInterval);

            if (index < 0 || index >= this.points.length) {
                return;
            }
            this.points[index].interfere(y, velocity);
        },
        reverseVertical: function () {
            this.reverse = !this.reverse;

            for (let i = 0, count = this.fishes.length; i < count; i++) {
                this.fishes[i].reverseVertical();
            }
        },
        controlStatus: function () {
            for (let i = 0, count = this.points.length; i < count; i++) {
                this.points[i].updateSelf();
            }
            for (let i = 0, count = this.points.length; i < count; i++) {
                this.points[i].updateNeighbors();
            }
            if (this.fishes.length < this.fishCount) {
                if (--this.intervalCount === 0) {
                    this.intervalCount = this.MAX_INTERVAL_COUNT;
                    this.fishes.push(new FISH(this));
                }
            }
        },
        render: function () {
            requestAnimationFrame(this.render);
            this.controlStatus();
            this.context.clearRect(0, 0, this.width, this.height);
            this.context.fillStyle = 'hsl(0, 0%, 0%)';

            for (let i = 0, count = this.fishes.length; i < count; i++) {
                this.fishes[i].render(this.context);
            }
            this.context.save();
            this.context.globalCompositeOperation = 'xor';
            this.context.beginPath();
            this.context.moveTo(0, this.reverse ? 0 : this.height);

            for (let i = 0, count = this.points.length; i < count; i++) {
                this.points[i].render(this.context);
            }
            this.context.lineTo(this.width, this.reverse ? 0 : this.height);
            this.context.closePath();
            this.context.fill();
            this.context.restore();
        }
    };
    SURFACE_POINT.prototype = {
        SPRING_CONSTANT: 0.03,
        SPRING_FRICTION: 0.8,
        WAVE_SPREAD: 0.3,
        ACCELARATION_RATE: 0.01,

        init: function () {
            this.initHeight = this.renderer.height * this.renderer.INIT_HEIGHT_RATE;
            this.height = this.initHeight;
            this.fy = 0;
            this.force = {previous: 0, next: 0};
        },
        setPreviousPoint: function (previous) {
            this.previous = previous;
        },
        setNextPoint: function (next) {
            this.next = next;
        },
        interfere: function (y, velocity) {
            this.fy = this.renderer.height * this.ACCELARATION_RATE * ((this.renderer.height - this.height - y) >= 0 ? -1 : 1) * Math.abs(velocity);
        },
        updateSelf: function () {
            this.fy += this.SPRING_CONSTANT * (this.initHeight - this.height);
            this.fy *= this.SPRING_FRICTION;
            this.height += this.fy;
        },
        updateNeighbors: function () {
            if (this.previous) {
                this.force.previous = this.WAVE_SPREAD * (this.height - this.previous.height);
            }
            if (this.next) {
                this.force.next = this.WAVE_SPREAD * (this.height - this.next.height);
            }
        },
        render: function (context) {
            if (this.previous) {
                this.previous.height += this.force.previous;
                this.previous.fy += this.force.previous;
            }
            if (this.next) {
                this.next.height += this.force.next;
                this.next.fy += this.force.next;
            }
            context.lineTo(this.x, this.renderer.height - this.height);
        }
    };
    FISH.prototype = {
        GRAVITY: 0.4,

        init: function () {
            this.direction = Math.random() < 0.5;
            this.x = this.direction ? (this.renderer.width + this.renderer.THRESHOLD) : -this.renderer.THRESHOLD;
            this.previousY = this.y;
            this.vx = this.getRandomValue(4, 10) * (this.direction ? -1 : 1);

            if (this.renderer.reverse) {
                this.y = this.getRandomValue(this.renderer.height * 1 / 10, this.renderer.height * 4 / 10);
                this.vy = this.getRandomValue(2, 5);
                this.ay = this.getRandomValue(0.05, 0.2);
            } else {
                this.y = this.getRandomValue(this.renderer.height * 6 / 10, this.renderer.height * 9 / 10);
                this.vy = this.getRandomValue(-5, -2);
                this.ay = this.getRandomValue(-0.2, -0.05);
            }
            this.isOut = false;
            this.theta = 0;
            this.phi = 0;
        },
        getRandomValue: function (min, max) {
            return min + (max - min) * Math.random();
        },
        reverseVertical: function () {
            this.isOut = !this.isOut;
            this.ay *= -1;
        },
        controlStatus: function () {
            this.previousY = this.y;
            this.x += this.vx;
            this.y += this.vy;
            this.vy += this.ay;

            if (this.renderer.reverse) {
                if (this.y > this.renderer.height * this.renderer.INIT_HEIGHT_RATE) {
                    this.vy -= this.GRAVITY;
                    this.isOut = true;
                } else {
                    if (this.isOut) {
                        this.ay = this.getRandomValue(0.05, 0.2);
                    }
                    this.isOut = false;
                }
            } else {
                if (this.y < this.renderer.height * this.renderer.INIT_HEIGHT_RATE) {
                    this.vy += this.GRAVITY;
                    this.isOut = true;
                } else {
                    if (this.isOut) {
                        this.ay = this.getRandomValue(-0.2, -0.05);
                    }
                    this.isOut = false;
                }
            }
            if (!this.isOut) {
                this.theta += Math.PI / 20;
                this.theta %= Math.PI * 2;
                this.phi += Math.PI / 30;
                this.phi %= Math.PI * 2;
            }
            this.renderer.generateEpicenter(this.x + (this.direction ? -1 : 1) * this.renderer.THRESHOLD, this.y, this.y - this.previousY);

            if (this.vx > 0 && this.x > this.renderer.width + this.renderer.THRESHOLD || this.vx < 0 && this.x < -this.renderer.THRESHOLD) {
                this.init();
            }
        },
        render: function (context) {
            context.save();
            context.translate(this.x, this.y);
            context.rotate(Math.PI + Math.atan2(this.vy, this.vx));
            context.scale(1, this.direction ? 1 : -1);
            context.beginPath();
            context.moveTo(-30, 0);
            context.bezierCurveTo(-20, 15, 15, 10, 40, 0);
            context.bezierCurveTo(15, -10, -20, -15, -30, 0);
            context.fill();

            context.save();
            context.translate(40, 0);
            context.scale(0.9 + 0.2 * Math.sin(this.theta), 1);
            context.beginPath();
            context.moveTo(0, 0);
            context.quadraticCurveTo(5, 10, 20, 8);
            context.quadraticCurveTo(12, 5, 10, 0);
            context.quadraticCurveTo(12, -5, 20, -8);
            context.quadraticCurveTo(5, -10, 0, 0);
            context.fill();
            context.restore();

            context.save();
            context.translate(-3, 0);
            context.rotate((Math.PI / 3 + Math.PI / 10 * Math.sin(this.phi)) * (this.renderer.reverse ? -1 : 1));

            context.beginPath();

            if (this.renderer.reverse) {
                context.moveTo(5, 0);
                context.bezierCurveTo(10, 10, 10, 30, 0, 40);
                context.bezierCurveTo(-12, 25, -8, 10, 0, 0);
            } else {
                context.moveTo(-5, 0);
                context.bezierCurveTo(-10, -10, -10, -30, 0, -40);
                context.bezierCurveTo(12, -25, 8, -10, 0, 0);
            }
            context.closePath();
            context.fill();
            context.restore();
            context.restore();
            this.controlStatus(context);
        }
    };

    $(function () {
        RENDERER.init();
    });
}

export {
    translational_loginBox,
    create_fish
}